I was wondering if both (Army Combat Uniform & Battle Dress Uniform) have the same fit. I was looking for Propper pants and jacket in Multicam and also, I can't figure out if ACU's really different and worth it over BDU (like the camo render, fade resistance, material thickness and resistance, etc.) except for design (pockets configuration and such). Thanks!

As long as you order from the same manufacturer, they should be virtually the same. However, I recommend you buy surplus since you can get so much more for so much less money. Plus you get some sweet novelties like the US flag and division patches, but I HIGHLY recommend you remove the name and rank patches. This way, you'll also be certain that you'll be buying a reputable brand that's durable.